| KJ Cleaning Services Ltd | Administrative & support | 2025 |
| KLF Advisory Ltd | Information & communication | 2025 |
| KMB Lettings Limited | Hospitality | 2026 |
| KNM Bricklaying Limited | Construction | 2017 |
| KS Barber Properties Limited | Households | 2022 |
| L & D Gillett Ltd | Hospitality | 2026 |
| L Rawlings Electrical Services Ltd | Manufacturing | 2020 |
| LA Pizza Fortunata Ltd | Hospitality | 2025 |
| Ladders 2 Life Limited | Health & social care | 2023 |
| Lawdley Road Block a Limited | Real estate | 2015 |
| Lawdley Road Block B Limited | Real estate | 2015 |
| Leadership Management Consultancy Limited | Professional & scientific | 2010 |
| LEE Davies Haulage Ltd | Transport & logistics | 2005 |
| Lepingwell Event Management Limited | Professional & scientific | 2023 |
| Level UP With Laura Limited | Education | 2025 |
| Liam Jackson Family Funerals Ltd | Other services | 2026 |
| Liam Jackson Funeral Director Limited | Other services | 2026 |
| Liam Jackson Funerals Limited | Other services | 2026 |
| LIGHTERS4LIFE Limited | Wholesale & retail | 2019 |
| Lime Design (Cheltenham) Ltd | Professional & scientific | 2021 |
| LJ Funerals Limited | Other services | 2026 |
| Lloyd Albon Limited | Real estate | 2023 |
| LMD Construction (UK) Ltd | Construction | 2013 |
| Lords Hill Management (1993) Limited | Other services | 1993 |
| LT Leisure (Lydney) Ltd | Hospitality | 2024 |
| Lucky GL Limited | Hospitality | 2026 |
| Lucy Court Management Company Limited | Administrative & support | 1997 |
| LY & WC Properties Ltd | Real estate | 2020 |
| LYC Properties Limited | Real estate | 2020 |
| Lydbrook Valley Garage Limited | Wholesale & retail | 2015 |
| M & M Electrical Solutions Ltd | Construction | 2024 |
| M & M Gifford Limited | Real estate | 2024 |
| M P Contracting Limited | Construction | 2017 |
| M P Electrical Contractors (UK) Limited | Construction | 2007 |
| M-Tech (Precision) Limited | Professional & scientific | 2012 |
| M.B. Developments Ltd. | Administrative & support | 1984 |
| Maclare Limited | Administrative & support | 2022 |
| Maiflower Construction Limited | Construction | 2022 |
| Malcolm Paterson Limited | Construction | 2013 |
| Maple (199) Limited | Households | 2003 |
| Maple (272) Limited | Households | 2005 |
| Maple (318) Limited | Households | 2007 |
| Maple (356) Limited | Real estate | 2010 |
| Maple (383) Limited | Households | 2014 |
| Maple (408) Limited | Households | 2016 |
| Marine Motors Ltd | Manufacturing | 2022 |
| Mark Anthony Monk Financial Consultancy Ltd | Professional & scientific | 2013 |
| Mark Cronin Limited | Professional & scientific | 2025 |
| Mark Williams Electrical Limited | Construction | 2014 |
| Martin Hill Transport Services Limited | Transport & logistics | 2014 |
| Maureen Clancy Limited | Health & social care | 2017 |
| MBC Facilities Management Limited | Construction | 2021 |
| Meadow View Management (NO.1) Limited | Households | 1990 |
| MEC Scaffolding Limited | Construction | 2011 |
| Meliora Home Ltd | Real estate | 2017 |
| Melvin John Electrical Contracting Ltd | Manufacturing | 2015 |
| Memhet & Co Ltd | Other services | 2025 |
| Metafab Holdings Ltd | Professional & scientific | 2006 |
| Metafab Solutions Ltd | Manufacturing | 2006 |
| MG Contractors Limited | Construction | 2007 |
| MG Energy Limited | Construction | 2013 |
| MG Resprayz Ltd | Wholesale & retail | 2021 |
| Mike Cooper Limited | Construction | 2016 |
| Mike Etheridge Construction Limited | Construction | 1999 |
| Mikedelaneytherapy.Com Ltd | Health & social care | 2009 |
| Mitchem Ltd | Professional & scientific | 2004 |
| Mixchem Ltd | Manufacturing | 2023 |
| MJ Smith and Sons Ltd | Real estate | 2018 |
| Mkmm Ltd | Extraterritorial | 2013 |
| MMA Electrical Contractors Limited | Construction | 2001 |
| Mobile Sports Massage Ltd | Health & social care | 2026 |
| Mollot Limited | Professional & scientific | 2020 |
| Monmouth Golf Limited | Arts & recreation | 2025 |
| Montague Swinton Limited | Professional & scientific | 2025 |
| Morgan Engineering Limited | Manufacturing | 2005 |
| Morris Property Services Limited | Real estate | 2016 |
| Motorhouse Coleford Limited | Wholesale & retail | 2010 |
| Motorhouse Service Station Limited | Wholesale & retail | 2000 |
| MPD Contracts (South West) Ltd | Other services | 2018 |
| MPR Lubrication Limited | Manufacturing | 2020 |
| MR DIG Limited | Wholesale & retail | 2007 |
| Msfx Limited | Information & communication | 2010 |
| Mskay Rehab Ltd | Other services | 2025 |
| Muggly Ltd | Wholesale & retail | 2024 |
| Mulberry Strategic Management Ltd | Professional & scientific | 2025 |
| Mushet Business Centre Limited | Manufacturing | 2018 |
| N P W Property Services Limited | Construction | 2016 |
| Navigating Nonsense Limited | Professional & scientific | 2026 |
| Neil Mclachlan Design Ltd | Professional & scientific | 2020 |
| Netherwood Road Management Ltd | Real estate | 2003 |
| New Dunn Properties Limited | Construction | 2016 |
| Newhouse Building Supplies Limited | Wholesale & retail | 2019 |
| Newland Floors and Doors Ltd | Wholesale & retail | 2026 |
| Newland Group Holdings Ltd | Construction | 2023 |
| Newland Windows and Doors Ltd | Construction | 2023 |
| Nhbb Limited | Construction | 2025 |
| Nick Cooper Design & Build Limited | Construction | 2017 |
| Nick Kitson Ltd | Manufacturing | 2005 |
| Nicky Pretty Properties Limited | Households | 2023 |
| Nlsf Services Limited | Information & communication | 2017 |